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Go over your quizzesrecord grades,
put away in binder…….
August 26, 2011
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Linear Function Review
August 26, 2011
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Find the slope
1) (-2,1) (3,5)
2) (4,2) (-6,2)
3) (-3,5) (-3,-1)
2 1
2 1
y ym
x x
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Slope-Intercept Form
y = mx + b
Linear Equations
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• Always graph the y-intercept first!
• Slopes must be fractions when graphing.
• The numerator (top) of the fraction is the rise.
• The denominator (bottom) of the fraction is the run.
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4) Graph y = 2
23x
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5) Graph y = 2x + 7
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Horizontal Lines: HOY
x
yHorizontal Lines have 0 slope; therefore their equations are y = 0x + b or y = b
6) example: Write an equation of the line that passes through (-5, 5) and (7, 5).
y = 5
(-5, 5) (7, 5)
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Vertical Lines: VUX
x
yVertical Line have undefined slope. Their equation does not start with y. Their equation is x = #
7) example: Write an equation of the line that passes through (3, 6) and (3, -3).
x = 3(3, -3)
(3, 6)
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Standard Form:
Ax + By = Cyou can NOT tell the y-int or the slope FROM this form.
Linear Equations
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Standard Form: 3x - 2y = 18you CAN TELL the x and y intercepts from this form. Use the cover up method…8) Find the x and y intercepts
Linear Equations
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Graph the following ACCURATELY on graph paper!9) y = 3x – 4
10) y = -2x + 4
11) 3x – 2y = 8
12) 5y + 2x = -10
13) 3x – 4y = 4
14) -x – 2y = 10
15) y = -3
16) x = 6
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Today’s Vocabulary:
slope, slope-intercept form, standard form, horizontal lines, vertical lines, x and y intercepts
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Homework
WS 2